Plasma-Lyte A (pH 7.4)

Emergency & Prehospital

• Sepsis-induced hypoperfusion or septic shock: First-line crystalloid. Balanced crystalloid is suggested over 0.9% saline in adults and children.
• Hypovolemia and dehydration: vomiting, diarrhea, heat illness and other extracellular fluid losses
• Hemorrhagic shock: Use a small volume as a bridge. Stop once blood products are available.

ED / ICU / Transport

• Diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemic state (HHS): initial isotonic fluid (balanced crystalloid or 0.9% saline)
• Critically ill adults needing fluid: Many ICUs make it the default, especially when volumes are large or a chloride load is a concern.
• Transfusion: The label calls it compatible with blood. It may prime the set, run before or after blood, or dilute packed red cells.
• Interfacility transfer: Running at transfer as resuscitation or maintenance fluid.

Other Uses

• Source of water and electrolytes: Labeled for water and electrolytes, including perioperative replacement and as a drug carrier. It contains no dextrose.
• Alkalinizing agent: Labeled as an alkalinizing agent. Not for lactic acidosis, or for severe metabolic acidosis with severe liver or renal impairment.
• Not preferred: Not preferred in severe traumatic brain injury (TBI), raised intracranial pressure (ICP) and sepsis with TBI. Use 0.9% saline

• Chloride load: 98 mEq/L versus 154 mEq/L in 0.9% saline. Large volumes cause much less hyperchloremic metabolic acidosis.
• Strong ion difference: Once acetate and gluconate are metabolized, Na⁺ + K⁺ + Mg²⁺ minus Cl⁻ is about 50 mEq/L. That gap is why it is mildly alkalinizing, not acidifying.
• Where it goes: It spreads across the whole extracellular space, so most of a bolus moves into the interstitium. How much stays intravascular? That depends on volume status and capillary leak.
• Products: The US Baxter label values are shown above. Normosol-R pH 7.4 carries the same labeled electrolytes. Isolyte S pH 7.4 is nearly identical, with Na⁺ 141 mEq/L plus phosphate 1 mEq/L, 0.5 mmol/L.

Doses vary by protocol; follow local protocols and medical direction.

Available Forms

• Plasma-Lyte A Injection pH 7.4 (Multiple Electrolytes Injection, Type 1, USP): Single-dose VIAFLEX flexible bags of 500 and 1,000 mL. The 1,000 mL bag is the size usually stocked.
• Near-equivalent alternatives: Normosol-R pH 7.4 has the same electrolytes. Isolyte S pH 7.4 is close, with Na⁺ 141 mEq/L plus phosphate (see Names & Classification). Normosol-R pH 7.4 is labeled for priming the set and diluting packed red cells. Isolyte S pH 7.4 is labeled for adults only, and its label makes no blood-compatibility claim.
• Read the label before spiking: Normosol-M with dextrose and Isolyte P in dextrose are different maintenance fluids. Check the name before you spike the bag.

Adult Dosing

Pediatric Dosing

The label says pediatric use rests on clinical practice. See weight-based dosing.

Preparation & Administration

• Line: peripheral IV; IO per protocol. Use the largest practical catheter for rapid boluses
• Air embolism: close the vent on a vented set, use a dedicated line without extra connections, never connect bags in series, and do not pressurize the flexible bag to speed flow (label)
• Blood products: The label calls it compatible. It may prime the set, run before or after blood, run at the same time, or dilute packed red cells. It is as compatible as 0.9% saline. Follow the institutional transfusion policy.
• Inspect: solution clear with no precipitate; squeeze the inner bag for leaks; discard if the port protector is damaged
• Additives: may be incompatible; mix thoroughly, inspect for precipitate and do not store admixed bags
• Pump: run maintenance infusions on a pump with a set rate and volume limit

Contraindications

• Known hypersensitivity to the product (the only labeled contraindication)

Precautions

• Severe TBI or raised ICP: Use 0.9% saline instead. The BEST-Living individual-patient meta-analysis of 6 ICU trials found that in-hospital death in TBI was 19.1% with balanced fluid and 14.7% with saline. In children, the 2026 pediatric sepsis guideline says saline may be preferred when raised ICP is a concern.
• Do not use for: lactic acidosis, severe metabolic acidosis with severe liver or renal impairment, hypochloremic hypokalemic alkalosis, or correcting hypokalemia or hypomagnesemia (label)
• Hyperkalemia risk: Severe renal impairment, acute dehydration, extensive tissue injury or burns, heart failure, and drugs that raise K⁺. Avoid, or monitor K⁺.
• Hypermagnesemia risk: Severe renal impairment or magnesium therapy (e.g. eclampsia): avoid. In myasthenia gravis, magnesium can worsen weakness, so avoid it.
• Hypocalcemia: It contains no calcium, and the rise in pH lowers ionized calcium. Avoid in hypocalcemia.
• Alkalosis: Excess volume can cause metabolic alkalosis. Avoid in patients with alkalosis or at risk of it.
• Sodium and fluid retention: Heart failure, cirrhosis, renal disease, hyperaldosteronism, pre-eclampsia and corticosteroids all promote sodium and fluid retention. The result is overload and hypernatremia.
• Hyponatremia risk: Risk rises with SIADH, cardiac or pulmonary failure and diuretics. Brain edema raises the risk of severe brain injury.

Hold / Reassess If

• New crackles, falling SpO₂, rising work of breathing or rising oxygen need: stop, reassess volume
• No rise in blood pressure, perfusion or urine output after a bolus? Reassess before more fluid. Consider a vasopressor or blood.
• Na⁺ <135 mEq/L and falling, or new headache, vomiting or confusion: stop, check Na⁺
• K⁺ or Mg²⁺ above the reference range, or low ionized calcium: switch fluid per prescriber

Reported (frequency not established)

• Infusion-site pain and burning
• Hypersensitivity and infusion reactions: tachycardia, chest pain or discomfort, dyspnea, flushing, urticaria, chills, fever
• Hyperkalemia and hyponatremia (see below)
• Peripheral and tissue edema after large volumes

Serious / Life-Threatening

Overdose & Toxicity Management

• Signs: fluid overload with peripheral or pulmonary edema; hypernatremia, hyperkalemia and hypermagnesemia, especially with severe renal impairment; metabolic alkalosis with or without hypokalemia and low ionized calcium and magnesium
• Management: stop or reduce the infusion, correct electrolytes, and monitor fluid balance, electrolytes and acid-base status; consider any additives in the bag
• Antidote: none

Clinically Significant Interactions

IV Compatibility

• Blood products: The label calls it compatible: same set, concurrent infusion or packed red cell diluent. Follow institutional transfusion policy.
• Ceftriaxone: It contains no calcium, so the ceftriaxone-calcium precipitate warning for lactated Ringer's does not apply. Still, check each drug's label.
• Other additives: Some are incompatible. Check each drug's label and consult pharmacy.
• Verify with an institutional compatibility resource.

• Pediatrics: Pediatric use rests on clinical practice. Children are at higher risk of hyponatremia and of overload from repeated boluses. Reassess after every bolus. Balanced fluid did not change major kidney events versus 0.9% saline in children with septic shock. See the Pediatric Dosing table.
• Neonates: for a delivery-room newborn with evidence of hypovolemia who stays bradycardic (HR below 60/min) despite ventilation, compressions and epinephrine, AHA 2025 Part 5 (2b, C-EO) says 0.9% saline or blood at 10–20 mL/kg may be reasonable. It does not name balanced crystalloid. Immature kidneys handle sodium, potassium and magnesium less well. Monitor electrolytes closely.
• Pregnancy: The label reports no reproduction studies. It is not known whether it can cause fetal harm, so give it only if clearly needed. Its components are normal plasma electrolytes and water. That is physiologic reasoning, not study data. Pre-eclampsia raises the risk of overload and edema. Avoid it in women on magnesium for eclampsia.
• Lactation: The label says excretion into milk is unknown, so use caution. Its components are normal plasma electrolytes. That is physiologic reasoning, not study data.
• Older Adults: Older adults carry a higher risk of electrolyte imbalance and overload. Start at the low end, use smaller boluses and monitor renal function.
• Renal Impairment: Sodium, potassium and magnesium can build up. The label says avoid it in severe renal impairment, or monitor closely if use is unavoidable. End-stage kidney disease gets smaller boluses.
• Hepatic Impairment: Cirrhosis predisposes to sodium and fluid retention. Not for severe metabolic acidosis when severe liver impairment may limit buffer metabolism.
• Obesity / Dosing Weight: Calculate sepsis volumes on actual body weight. With BMI above 30 kg/m², the Surviving Sepsis Campaign 2026 allows adjusted or ideal body weight, or follow the local protocol. Bolus by response, not by formula alone.
• Traumatic Brain Injury: Use 0.9% saline. In the BEST-Living individual-patient meta-analysis of 6 ICU trials, in-hospital death in TBI was 19.1% with balanced fluid and 14.7% with saline.

• Scope: Peripheral IV and IO access with non-medicated IV crystalloid is an AEMT, Paramedic, RN and critical-care transport (CCT) skill under the National EMS Scope of Practice Model. Your state scope, and whether a specific product such as Plasma-Lyte A is carried, varies by state and agency.
• Storage & Stability: Store at room temperature, 25°C (77°F), in the moisture-barrier overwrap. A brief exposure up to 40°C (104°F) does not harm the product. Avoid excessive vehicle heat.
• Carried Product: Agencies may stock Plasma-Lyte A or Normosol-R pH 7.4. Confirm the product name at handoff.
• Rapid Infusion: The label says not to pressurize the flexible bag, because air can embolize. If agency protocol permits a pressure bag or a rapid infuser that compresses the bag, that departs from the label. Remove all residual air first. Watch the bag and line throughout. Never connect bags in series.
• Temperature: Warm the fluid for trauma, infants and large volumes, per protocol. The point is to prevent hypothermia.
• Handoff Essentials: indication, total volume and time of each bolus, current rate, response (blood pressure, perfusion, urine output), lung findings, and any blood run through the same line.

Mechanism of Action

• Supplies water and electrolytes close to plasma concentrations. That expands extracellular (and briefly intravascular) volume, which restores preload and perfusion.
• Low chloride (98 mEq/L) means less hyperchloremic metabolic acidosis than 0.9% saline.
• Acetate and gluconate are metabolized to carbon dioxide and water, consuming hydrogen ions. The net result is a bicarbonate gain and a mild alkalinizing effect.
• Calcium-free, so it is compatible with citrated blood. But the rise in pH can lower ionized calcium.

Pharmacokinetics

• Half-life: No meaningful drug half-life. The effect follows volume, rate and capillary leak.
• Metabolism: Acetate and gluconate are broken down to carbon dioxide and water, which generates bicarbonate.
• Elimination: The kidneys mainly excrete sodium, potassium, magnesium and water.

Generic Name

Multiple Electrolytes Injection, Type 1, USP (sodium chloride, sodium gluconate, sodium acetate, potassium chloride and magnesium chloride)

Brand Names

Plasma-Lyte A Injection pH 7.4 (Baxter). Same labeled electrolytes: Normosol-R pH 7.4 (ICU Medical). Near-identical: Isolyte S pH 7.4 (B. Braun; Na⁺ 141 mEq/L plus phosphate 1 mEq/L).

Pharmacologic Class

Balanced crystalloid (electrolyte solution with acetate and gluconate buffers)

Therapeutic Class

IV fluid; volume and electrolyte replacement; alkalinizing agent

Controlled Substance

Not controlled

ISMP High-Alert

No

Look-Alike / Sound-Alike

None commonly reported as a named pair; in practice Normosol-R and Normosol-M with dextrose, and Isolyte S and Isolyte P in dextrose, look and sound alike